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H. W. SANDER.

ELECTRIC ARC LAMP.

No. 458,500. Patented Aug. 25, 1891.

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UNITED STATES PATENT OFFICE.

HERMANN IV. SANDER, OF ST. LOUIS, MISSOURI, ASSIGNOR OF ONE-HALF TOMARTIN D. MEMMEL, OF SAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 458,500, dated August25, 1891.

Application filed May 4, 1891. Serial No. 391,499. (No model.)

To all whom it may concern:

Be it known that I. HERMANN W. SANDER, of the city of St. Louis, in theState of Hissouri, have invented a certain new and useful 5 Improvementin Are Lights, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, formingpart of this specification.

My invention has for its object to produce an electric-arc light inwhich the arc will always remain at a given point and not shift as thecarbons or pencils are consumed; and it further relates to a lamp inwhich a larger amount of carbon is available than with the I ordinaryform of are light.

To this end my invention, broadly stated, consists in certain featuresof novelty, as more fully described hereinafter, and pointed out in theclaims.

Figure I is an elevation illustrative of my invention. Fig. II is adetail section taken on line II II, Fig. 1.

Referring to the drawings, 1 represents the carbons or pencils, whichare made in the are :5 of a circle, as shown.

2 represents a stationary arm having branches 3, each provided with asocket I to receive one of the carbons or pencils. This arm is eithercomposed of some non-conductor or else is provided with an insulator,and I have shown its branches provided with nonconducting sleeves 5,through which the carbons pass. The arm is supported on a sleeve 6, witha non-conductor 7 between it and the 3 5 sleeve. 8 represents pivotedarms, with which the wires 9 are connected. On the outer end of each armis a socket 10, receiving one of the carbons, and the carbons are firmlyheld in the sockets by set-screws 11. Theinner ends 0 of the arms 8 aremounted on the sleeve 6, from which they are insulated by thenonconductor 7. \Vhen the lamp is in use, the arms 8 are automaticallymoved by any wellknown means to feed the points of the carbons togetheras they burn away.

In Fig. I, I have shown the arms in dotted lines, to which position theymove and continue to move until they come against the branches 3 of thestationary arm 2.

In a lamp thus constructed the arc will always remain at one point, anda larger amount of carbon is available than can be had where the carbonsare straight.

I claim as my invention 5 1. In an are light, the combination, with thecircular carbons pivoted to swing together, of the guide-arm 2,havingbranches 3,provided with insulating or non-conducting sleeves throughwhich the said carbons pass, substan- 6c tially as set forth.

2. In an are light, the combination of the sleeve 6, the arms 8, pivotedon said sleeve and being insulated therefrom and from each other, thefixed arm 2, secured to said sleeve and being insulated therefrom andfrom the arms 8, the arms 8 being provided with sockets 10 and the arm 2being provided with rigid branch arms 3, each having a socket 4,aninsulating-sleeve 5 in each socket i, and the circular carbons securedin the sockets 10 and projecting through said insulating-sleeves 5,substantially as set forth.

II. \V. SANDER.

In presence of- E. S. KNIGHT, THos. KNIGHT.

